CN108491091B - A kind of independent keyboard state recognition and coding method - Google Patents
A kind of independent keyboard state recognition and coding method Download PDFInfo
- Publication number
- CN108491091B CN108491091B CN201810338473.0A CN201810338473A CN108491091B CN 108491091 B CN108491091 B CN 108491091B CN 201810338473 A CN201810338473 A CN 201810338473A CN 108491091 B CN108491091 B CN 108491091B
- Authority
- CN
- China
- Prior art keywords
- keyboard
- state
- key
- output
- buffer register
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000000872 buffer Substances 0.000 claims abstract description 65
- 230000008859 change Effects 0.000 claims abstract description 26
- 230000003139 buffering effect Effects 0.000 claims abstract description 13
- 238000012423 maintenance Methods 0.000 claims description 13
- 230000006399 behavior Effects 0.000 claims description 3
- 230000007423 decrease Effects 0.000 abstract description 9
- 230000004048 modification Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 3
- 239000013256 coordination polymer Substances 0.000 description 46
- 230000006870 function Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 10
- 230000000630 rising effect Effects 0.000 description 7
- 230000001960 triggered effect Effects 0.000 description 7
- 238000003825 pressing Methods 0.000 description 5
- 241001269238 Data Species 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 102100040862 Dual specificity protein kinase CLK1 Human genes 0.000 description 1
- 102100040844 Dual specificity protein kinase CLK2 Human genes 0.000 description 1
- 101000749294 Homo sapiens Dual specificity protein kinase CLK1 Proteins 0.000 description 1
- 101000749291 Homo sapiens Dual specificity protein kinase CLK2 Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007688 edging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 210000000352 storage cell Anatomy 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
- H03M11/20—Dynamic coding, i.e. by key scanning
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Input From Keyboards Or The Like (AREA)
Abstract
A kind of independent keyboard state recognition and coding method are realized by the circuit that independent keyboard, the first buffer register, the second buffer register, encoder form, and include the independent keyboard output N bit keyboard status signal of N number of key；N bit keyboard status signal is subjected to level 2 buffering latch by clock pulses control buffer register, the data of first-level buffer output are existing state key assignments, and the data of level 2 buffering output are preceding state key assignments；Existing state key assignments and preceding state key assignments collectively constitute 2 × N status codes；Encode simultaneously run-out key number to status code；Different single key stroke, combination key operation, keyboard maintain state operation to be only embodied in not being same as above for status code；Button operation function is either adjusted if necessary to increase and decrease button operation function, does not need modification circuit structure, it only need to be according to the encoded content of the status code after increase and decrease and the change encoder of the corresponding relationship between key number.The method does not have to write and run program, reliable operation.
Description
Present patent application is divisional application, and application No. is 201610003648.3, the applying date is in January, 2016 for original bill
5 days, entitled independent keyboard state recognition and coding circuit.
Technical field
The present invention relates to a kind of Scan orientation method of keyboard, especially a kind of independent keyboard state recognition and coding staff
Method.
Background technique
With the continuous development of embedded technology, current each electronic product generallys use microcontroller as control core
The heart, keyboard are widely used as main input equipment.
Current keyboard scan is mainly controlled by microcontroller, need by operation microcontroller in program come into
Row, encounters interference, program is caused to run fast, and scanner program is by cisco unity malfunction.
Application No. is the patents of invention of CN201010153560.2 " a kind of fast scanning and positioning method of matrix keyboard " to adopt
The Scan orientation process for entering keyboard with the mode that keyboard interrupt triggers is judged using the method that keyboard scan step is repeated several times
Whether key is effective, and carries out state judgement to key assignments obtained；If multiple repairing weld state is identical, it is in and stablizes shape
State, key assignments are effective；If multiple repairing weld state is different, key assignments is invalid.Single key stroke or combination key operation need individually judgement, such as
It is single key stroke, then enters singly-bound tupe；Combination key operation in this way then enters Macintosh tupe.Described in the patent
Method solves the shake of the keyboard as caused by the mechanical property of keyboard itself and causes the Problem-Errors such as wrong key, continuous touching,
And the support issue to Macintosh and repeat key.But the method single key stroke needs to handle respectively with key operation is combined；
Not accounting for keyboard state maintains a period of time just to execute the keyboard operation function of effectively operating after；Increase and decrease button operation function
When either adjusting button operation function, need to modify keyboard scan finder structure.
Summary of the invention
In order to solve above-mentioned technical problem existing for existing keyboard scan localization method, the present invention provides a kind of stand alone types
Keyboard state identification and coding method include the independent keyboard output N bit keyboard status signal of N number of key；By clock arteries and veins
N bit keyboard status signal is carried out level 2 buffering latch by punching control buffer register, and the data of first-level buffer output are existing state key
Value, the data of level 2 buffering output are preceding state key assignments；Existing state key assignments and preceding state key assignments collectively constitute 2 × N status codes；To shape
State code encode and run-out key number；The N bit keyboard status signal is level signal.
The existing state key assignments of the N bit keyboard status signal is that the N bit keyboard state that clock pulses was effectively triggered along the moment is believed
Number, the preceding state key assignments of N bit keyboard status signal is a N bit keyboard status signal for effectively triggering along the moment in clock pulses；Institute
Clock pulses is stated effectively to trigger along the rising edge for being clock pulses；The clock pulses effectively triggers along or is clock pulses
Failing edge.
The status code is made of effective status code and invalid state code, for identification the current state of independent keyboard and
Mode of operation；The key number is made of effective key number and invalid key number；The effective status code is by effective keyboard operation or state
It generates, the corresponding effectively key number of corresponding output；The invalid state code is generated by invalid keyboard operation or state, corresponding output nothing
Imitate key number.The key number is M, and the selection of M value should meet 2MMore than or equal to the sum of effective key number and the quantity of invalid key number.
Effective keyboard operation includes singly-bound pushing operation, singly-bound release operates, singly-bound presses maintenance operation, Macintosh
Operation.After the combination key operation refers to that singly-bound is pressed, then press the operation of other keys；The invalid keyboard operation is effective
Operation except keyboard operation.
It is described status code to be encoded and run-out key number is realized by encoder.When encoder inputs all invalid state codes
All corresponding output invalid key number, invalid key number are a value except all effective keys number.Further, the encoder is only
Read memory；Storage content by modifying read-only memory increases and decreases button operation function and either adjusts button operation function.
Described latched N bit keyboard status signal progress level 2 buffering by clock pulses control buffer register is delayed by first
It rushes register and the second buffer register is realized；First buffer register and the second buffer register be N two into
Register processed；The position the N data input pin of first buffer register is connected to N bit keyboard status signal output, and the second buffering is posted
The position the N data input pin of storage is connected to the position the N data output end of the first buffer register；First buffer register connects
The reception pulse input end for receiving pulse input end and the second buffer register is connected to clock pulses.
The position N, 2 × N, M refer both to binary digit；The period of the clock pulses is 20~100ms；The N
Meet one-to-one relationship between bit keyboard status signal and N number of key.
Independent keyboard state recognition and coding method are realized by independent keyboard state recognition and coding circuit.It is described only
Vertical keyboard, the first buffer register, the second buffer register, encoder composition independent keyboard state recognition and coding electricity
Road.
Further, when the key number of output changes, keyboard state change pulse is exported.The independent keyboard shape
State identification and coding circuit further include keyboard state change pulse generate unit, the keyboard state change pulse by or door, M
The keyboard state change pulse of delay buffer and M XOR gate composition generates unit output；M delay buffers are used for only
The position the M key number of vertical keyboard output carries out signal delay respectively；The input of M XOR gate is respectively the defeated of M delay buffers
Enter, output signal；The output of M XOR gate is respectively connected to or the input terminal of door；Or the output end output keyboard state of door becomes
Change pulse.
The independent keyboard state recognition and coding circuit further include oscillator；The oscillator exports clock pulses.
The beneficial effects of the present invention are: the positioning for state operation being maintained to single key stroke, combination key operation, keyboard, by
Clock pulses scan transformation is handled by the way of Unified coding at the status code of same binary length, single key stroke,
Combination key operation, keyboard maintain state operation to be only embodied in not being same as above for status code；If necessary to increase and decrease button operation function or
Person is adjustment button operation function, does not need modification keyboard scanning circuit structure, only need to be according to the status code and key number after increase and decrease
Between corresponding relationship change encoder content, i.e. remodify be written read-only memory storage content.The side
Method does not use the microcontrollers such as single-chip microcontroller, ARM, does not have to operation program, reliable operation.
Detailed description of the invention
Fig. 1 is independent keyboard state recognition and coding circuit functional block diagram；
Fig. 2 is the independent keyboard circuit diagram of the embodiment of the present invention；
Fig. 3 is the scanning encoding circuit diagram of the embodiment of the present invention；
Fig. 4 is that the keyboard state change pulse of the embodiment of the present invention generates the circuit diagram of unit；
Fig. 5 is the waveform correlation schematic diagram that the keyboard of the embodiment of the present invention effectively operates.
Specific embodiment
Below in conjunction with attached drawing, the invention will be further described.
Fig. 1 is independent keyboard state recognition and coding circuit functional block diagram, is posted by the buffering of independent keyboard 400, first
Storage 100, the second buffer register 200, encoder 300, oscillator 500 form.
Fig. 2 is the circuit diagram of the independent keyboard 400 of the embodiment of the present invention, shares 4 keys, by key S1, key S2,
Key S3, key S4 and the pull-up resistor R1, pull-up resistor R2, pull-up resistor R3, pull-up resistor R4 group for being connected to power supply+VCC
At.4 output ends of independent keyboard 400 correspond the state of output key S1, key S2, key S3, key S4 respectively
Signal I1, I2, I3, I4, when by key pressing, the status signal of corresponding output end is low level；It is corresponding to export when key is not pressed
The status signal at end is high level.
The first buffer register 100, the second buffer register 200, encoder 300 in Fig. 1 form scanning encoding circuit,
Embodiment circuit diagram is as shown in Figure 3.Independent keyboard circuit has 4 keys, and therefore, the first buffer register 100, second is slow
It rushes register 200 and is required to 4 bit binary datas of deposit.4 data input pin D10~D13 of the first buffer register 100 connect
It is connected to I1, I2, I3, I4；4 data input pin D24~D27 of the second buffer register 200 are connected to the first buffer register
100 4 output end Q10~Q13；In 8 input terminal A0~A7 of encoder 300,4 are connected to the first buffer register
100 4 output end Q10~Q13, in addition 44 output end Q24~Q27 for being connected to the second buffer register 200.Coding
Device 300, which exports, is scanned 4 determining binary system keys number of coding.
In Fig. 3, trigger 101 forms the first buffer register 100, trigger 201 forms the second buffer register 200.
Trigger 101 is made of 4 edge triggered flip flops, and the triggering input terminal CLK1 of 4 edge triggered flip flops is the first buffer register 100
Reception pulse input end, be connected to the CP output terminal of clock pulse of oscillator 500；Trigger 201 is by 4 edge triggered flip flops
The triggering input terminal CLK2 of composition, 4 edge triggered flip flops is the reception pulse input end of the second buffer register 200, is all connected with
To the CP output terminal of clock pulse of oscillator 500.Trigger 101, trigger 201 are preferably made of the d type flip flop of edging trigger,
For example, being made of double D trigger 74HC74,4D trigger 74HC175,8D trigger 74HC273.In Fig. 3 embodiment, trigger
101, trigger 201 selects the 8D trigger 74HC273 of rising edge triggering, at this point, by clear input unillustrated in Fig. 3
It is connected to high level, the Protection Counter Functions of 74HC273 is made to be in invalid state, only there is Trigger Function.Trigger 101 and trigger
201 only need 4D trigger, respectively arbitrarily using 4 d type flip flops in selected 8D trigger 74HC273.8D triggering
The triggering input terminal of device 74HC273 is connected to CP.
In Fig. 3, read-only memory 301 forms encoder 300.Address input end A7~A0 of read-only memory 301 is to compile
The input terminal of code device 300, data output end D3~D0 of read-only memory 301 are coding output end C3~C0 of encoder 300.
Embodiment is not drawn into the circuit of oscillator 500, and oscillator 500 is multivibrator, and the output period is 20~100ms
Rectangular wave, the rectangular wave be Fig. 3 in CP clock pulses.CP clock pulses can also be by independent keyboard state recognition and volume
Circuit or device except code circuit provide.
Independent keyboard state recognition and coding method principle are as follows:
First buffer register 100, the second buffer register 200 are under the control of CP clock pulses, in each week of CP
Effective triggering of phase is along progress data latch.In Fig. 3,74HC273 is that rising edge triggering is effective, and therefore, CP clock pulses has
Effect triggering edge is rising edge.
4 output datas of the first buffer register 100 only pass through first-level buffer, and 4 of the second buffer register 200 are defeated
Data have passed through level 2 buffering out.Therefore, on effective triggering edge of CP clock pulses, the first buffer register 100 corresponding 4
The data that data output end Q10~Q13 is latched are the current state of independent keyboard, and 4 digits are stated to be existing state key assignments；Second
200 corresponding 4 data output end Q24~Q27 of buffer register latch data be independent keyboard previous state, 4
State key assignments before digit is stated to be.4 existing state key assignments and 4 preceding state key assignments collectively constitute 8 status codes.
The current state and mode of operation of 8 status codes independent keyboard for identification.For example, the present embodiment
In, the status code of no key pressing is 11111111；The status code of S1 key singly-bound pushing operation is 11111110；S1 key singly-bound is pressed
And the status code maintained is 11101110；The status code of S1 key singly-bound release operation is 11101111；S2 key singly-bound pushing operation
Status code be 11111101；The status code of S4 key singly-bound pushing operation is 11110111；The S1 of S2+S1 combination operation presses behaviour
Make, after expression first presses S2, maintains the state pressed to press the operation of S1 again in S2, the status code of the operation is 11011100.
Encoder 300 is used to status code being converted to key number.In embodiment, it is equipped with 7 effective keyboard operations and state,
Include:
The singly-bound pushing operation of operation 0: key S1, key number are 0000；
The singly-bound pushing operation of operation 1: key S2, key number are 0001；
The singly-bound pushing operation of operation 2: key S3, key number are 0010；
Operation 3: key S3 singly-bound press after maintenance state, key number be 0011；
Operation 4: after key S4 singly-bound is pressed, then pressing the button the combination key operation of S1, and key number is 0100；
Operation 5: after key S4 singly-bound is pressed, then pressing the button the combination key operation of S2, and key number is 0101；
The singly-bound of operation 6: key S1 discharges operation, and key number is 0110.
The status code and key number obtained according to above-mentioned regulation is shown in coding schedule 1:
1 coding schedule of table
| Keyboard operation | Status code (address) | Key number (storing data) |
| S1 singly-bound is pressed | 11111110 | 0000 |
| S2 singly-bound is pressed | 11111101 | 0001 |
| S3 singly-bound is pressed | 11111011 | 0010 |
| S3 singly-bound presses maintenance | 10111011 | 0011 |
| S4+S1 combination operation | 01110110 | 0100 |
| S4+S2 combination operation | 01110101 | 0101 |
| The release of S1 singly-bound | 11101111 | 0110 |
| Other operations or state | ******** | 1111 |
Encoder 300 is combinational logic circuit, designs circuit, meets the logical relation of table 1.
The encoder 300 of embodiment is preferably made of read-only memory 301.Read-only memory 301 has 8 bit address, and totally 28
A 4 binary storage cells.7 effective keyboard operations and state have 7 effective status codes, corresponding 7 effective keys number；
It, will in storage unit corresponding with 7 effective status codes using status code as address A7~A0 of read-only memory 301
Corresponding key number is written as storing data.The status code generated except 7 effective keyboard operations and state is invalid state
Code, i.e., other operations or state in table 1 are generated for invalid state code；In other storage units, all write-in is invalid
Key number, invalid key number are that one except 7 effective keys number is worth, and in embodiment, invalid key number is 1111.
Read-only memory 301 always works at data output state.When read-only memory 301 has piece selected control system, data
When exporting cushioning control function, its piece selected control system, data output cushioning control should be made to be in effective status.
Key number in embodiment is 4 binary codes.The number of bits of key number can according to need increase, or subtract
It is few, at this point, need to only select the read-only memory 301 to match with this.If the number of bits of key number is M, the selection of M value
2 should be metMMore than or equal to the sum of effective key number and the quantity of invalid key number.When independent keyboard has N bit keyboard status signal defeated
When out, read-only memory 301 needs the input of 2 × N bit address, M-bit data output.
Button operation function is either adjusted if necessary to increase and decrease button operation function, only need to modify table 1 as needed, it will
Modified content re-writes the storage content of read-only memory 301.
In embodiment, when independent keyboard S1 singly-bound is pressed, CP clock pulses of the encoder 300 after S1 singly-bound is pressed
Effective triggering along starting, to effective triggering edge of next CP clock pulses until, coding output end C3~C0 run-out key number
0000；When independent keyboard S2 singly-bound is pressed, effective triggering edge of CP clock pulses of the encoder 300 after S2 singly-bound is pressed
Start, until effective triggering edge of next CP clock pulses, run-out key number 0001；After independent keyboard first presses S4,
S1 is pressed again, and encoder 300 starts on effective triggering edge that S1 combines the CP clock pulses after key pressing, until next CP clock
Until effective triggering edge of pulse, run-out key number 0100；When the release of independent keyboard S1 singly-bound, encoder 300 is in S1 singly-bound
Effective triggering edge of CP clock pulses after release starts, until effective triggering edge of next CP clock pulses, run-out key
Number 0110；Therefore, it can be seen that when identification be effective button operation of independent keyboard when, encoder 300 is effectively pressed at this
Effective triggering edge of CP clock pulses after key operation starts, until effective triggering edge of next CP clock pulses, output
Duration is effective key number of CP width clock cycle.
In embodiment, when independent keyboard S3 singly-bound is pressed, CP clock pulses of the encoder 300 after S3 singly-bound is pressed
Effective triggering along starting, until effective triggering edge of next CP clock pulses, run-out key number 0010；In next CP
Effective triggering edge of clock pulses starts, until effective touching of next CP clock pulses after S3 singly-bound presses maintenance state
Until sending out edge, 300 run-out key number 0011 of encoder；Therefore, it can be seen that when identification be the maintenance state of independent keyboard when,
Encoder 300 exports the duration of effective key number and the duration of the maintenance state is adapted.
When except the state of keyboard or operation being 7 effective keyboard operations described in table 1 and state, encoder
300 output invalid keys number 1111.Effective key number, or output invalid key number are either exported, encoder 300 changes output content
At the time of for CP clock pulses effective triggering edge；In embodiment, encoder 300 is CP clock arteries and veins at the time of changing output content
The rising edge of punching.
The period of CP clock pulses is the scan period of independent keyboard.The keyboard scan period, can in 20ms or more
It has been effectively shielded from the influence of keyboard shake；The keyboard scan period in 100ms or less, is unlikely to omit keyboard operation；
Therefore, the period of CP clock pulses should control in 20~100ms.
Fig. 4 is that the keyboard state change pulse of the embodiment of the present invention generates the circuit diagram of unit.What it is when identification is stand alone type
When effective button operation of keyboard, effective triggering edge of CP clock pulses of the encoder 300 after effective button operation starts,
Until effective triggering edge of next CP clock pulses, output duration is the effective of CP width clock cycle
Key number.The device for receiving the independent keyboard output, needs to inquire the output of independent keyboard constantly, obtains key number.Inquiry
Period distances be necessarily less than period of CP clock pulses.
Circuit shown in Fig. 4 is used to judge whether the key number of independent keyboard output to change, when independent keyboard exports
Key number when changing, keyboard state change pulse is exported, for assisting the reception device of independent keyboard to receive stand alone type
The key number of keyboard output, for example, using keyboard state change pulse as the interrupt request singal of reception device.
Circuit shown in Fig. 4 by delay buffer 601, XOR gate 602, XOR gate 603, XOR gate 604, XOR gate 605 or
Door 606 forms.Delay buffer 601 is made of 4 edge triggered flip flops only with Trigger Function, the touching of 4 edge triggered flip flops
The reception pulse input end that input terminal is delay buffer 601 is sent out, the CP output terminal of clock pulse of oscillator 500 is connected to；
Delay buffer 601 carries out data latch on effective triggering edge of CP clock pulses.
Delay buffer 601 is used to carry out at delay 4 data C3~C0 of the coding output end of encoder 300 respectively
Reason.4 data input pin D63~D60 of delay buffer 601 are connected to coding output end C3~C0 of encoder 300, delay
The data that 4 data output end Q63~Q60 of buffer 601 are accordingly exported are C31~C01；C31~C01 is by delay buffering
After the first-level buffer of device 601, signal ratio C3~C0 postpones a CP clock cycle, and Fig. 5 show the embodiment of the present invention
The waveform correlation schematic diagram that effectively operates of keyboard.It is located at the section T1 of CP clock pulses, independent keyboard exists primary effective
Effective operation of operation, embodiment includes: that S1 singly-bound is pressed, S2 singly-bound is pressed, S3 singly-bound is pressed, the S1 of S4+S1 combination operation
It presses, the S2 of S4+S2 combination operation is pressed, the release of S1 singly-bound.On the next effective triggering edge once effectively operated, i.e. Fig. 5
Rising edge after the middle section CP clock pulses T1, coding C3~C0 that encoder 300 exports change；In the section T2, compile
Code device 300 exports efficient coding C3~C0 of a cycle；In T3, T4 and section later, coding C3 that encoder 300 exports~
C0 changes again and enters maintenance state, which may be that such as S1 singly-bound presses subsequent maintenance state, output
Invalid key number, it is also possible to which S3 singly-bound presses subsequent maintenance state, exports effective key number, until effectively operation next time.
Coding C3~C0 that D6 pulse in Fig. 5 schematically illustrates the output of encoder 300 is not become in maintenance state
Change, still change, the D6 pulse is not present in actual circuit.As shown in figure 5, D6 pulse is low level, schematic table
Show that coding C3~C0 that encoder 300 exports is not changed in maintenance state；D6 pulse is high level, schematically illustrates volume
Code device 300 exports efficient coding C3~C0 of a cycle.What the Q6 in Fig. 5 reflected is the situation of change of C31~C01, it is clear that
Q6 ratio D6 postpones a CP clock cycle.Equally, the Q6 pulse is not present in actual circuit.
In Fig. 5, coding C3~C0 that encoder 300 exports is not changed, still changes in maintenance state,
Really by 606 4 delay buffers 601, XOR gate 602, XOR gate 603, XOR gate 604, XOR gate 605 or door groups
At logic circuit complete.1 corresponding, input point that 4 XOR gates encode in output end C3~C0 respectively with encoder 300
It Wei not the inputs of 4 delay buffers 601, output signal.For example, two input signals of XOR gate 602 be respectively C0 and
C01, C01 ratio C0 postpone a CP clock cycle, and therefore, when C0 changes, XOR gate 602 exports 1 CP clock
The positive pulse of pulse period width；When C0 is a CP change width clock cycle signal, XOR gate 602 exports 2
The positive pulse of CP width clock cycle.XOR gate 603, XOR gate 604, XOR gate 605 judge whether C1~C3 sends out respectively
Changing, principle with judge it is identical whether C0 changes.XOR gate 602, XOR gate 603, XOR gate 604, XOR gate 605
Output end is respectively connected to or whether the input terminal of door 606 or door 606 change for comprehensive descision C0~C3, as long as C0
~C3 changes or door 606 exports keyboard state change pulse F, which is positive pulse.
In embodiment, delay buffer 601 selects the 8D trigger 74HC273 of rising edge triggering.
Delay buffer 601 can also use other schemes, for example, using RC circuit, using 4 RC circuits respectively to C0
~C3 is postponed；If the clock cycle CP of delay time of RC circuit less than one, encoder 300 exports a week
When efficient coding C3~C0 of phase, starting and export efficient coding C3~C0 in output efficient coding C3~C0 terminates all to generate one
The width of a keyboard state change pulse, keyboard state change pulse is equal to RC circuit delay time；If the delay of RC circuit
Time is more than or equal to a CP clock cycle, then when encoder 300 exports efficient coding C3~C0 of a cycle, defeated
A keyboard state change pulse is generated when efficient coding C3~C0 starts out, pulse width is more than or equal to 2 CP clock pulses
Period.It is required that the delay time of RC circuit is no more than 2 CP clock cycles, failed to report in order to avoid generating.
In the invention circuit, the positioning of state operation will be maintained to single key stroke, combination key operation, keyboard, by CP
Pulse scan transformation is handled by the way of Unified coding at the status code of same binary length, single key stroke, combination
Key operation, keyboard maintain state operation to be only embodied in not being same as above for status code；If necessary to increase and decrease button operation function either
Button operation function is adjusted, modification keyboard scanning circuit structure is not needed, need to only be updated and be encoded according to the state code table after increase and decrease
Device 300 re-writes the storage content for updating read-only memory 301.The invention circuit do not use single-chip microcontroller,
The microcontrollers such as ARM do not have to operation program, reliable operation.
Claims (9)
1. a kind of independent keyboard state recognition and coding method, it is characterised in that: include N number of key independent keyboard it is defeated
N bit keyboard status signal out；N bit keyboard status signal is subjected to level 2 buffering latch by clock pulses control buffer register,
The data of first-level buffer output are existing state key assignments, and the data of level 2 buffering output are preceding state key assignments；Existing state key assignments and preceding state key assignments
Collectively constitute 2 × N status codes；Encode simultaneously run-out key number to status code by encoder；Institute's rheme is binary digit；
When the key number of output changes, keyboard state change pulse is exported；The keyboard state change pulse by or door, M
The keyboard state change pulse of position delay buffer and M XOR gate composition generates unit output；M delay buffers for pair
The position the M key number of independent keyboard output carries out signal delay respectively；The input of M XOR gate is respectively M delay buffers
Input, output signal；The output of M XOR gate is respectively connected to or the input terminal of door；Or the output end of door exports keyboard state
Change pulse.
2. independent keyboard state recognition according to claim 1 and coding method, it is characterised in that: the N bit keyboard
The existing state key assignments of status signal is that clock pulses effectively triggers the N bit keyboard status signal along the moment, N bit keyboard status signal
Preceding state key assignments is a N bit keyboard status signal for effectively triggering along the moment in clock pulses.
3. independent keyboard state recognition according to claim 1 and coding method, it is characterised in that: the status code by
Effective status code and invalid state code form, for identification the current state and mode of operation of independent keyboard；The key number by
Effective key number and invalid key number form；The effective status code is generated by effective keyboard operation or state, and corresponding output is corresponding
Effective key number；The invalid state code is generated by invalid keyboard operation or state, corresponding output invalid key number.
4. independent keyboard state recognition according to claim 3 and coding method, it is characterised in that: effective keyboard
Operation includes singly-bound pushing operation, singly-bound release operates, singly-bound presses maintenance operation, combination key operation；The invalid keyboard behaviour
As the operation except effective keyboard operation.
5. independent keyboard state recognition according to claim 4 and coding method, it is characterised in that: the Macintosh behaviour
After work refers to that singly-bound is pressed, then press the operation of other keys.
6. independent keyboard state recognition according to claim 3 and coding method, it is characterised in that: the key number is M
Position, the selection of M value should meet 2MMore than or equal to the sum of effective key number and the quantity of invalid key number.
7. independent keyboard state recognition according to claim 6 and coding method, it is characterised in that: the encoder is
Read-only memory.
8. independent keyboard state recognition and coding method described in any one of -7 according to claim 1, it is characterised in that: institute
State by clock pulses control buffer register by N bit keyboard status signal carry out level 2 buffering latch by the first buffer register and
Second buffer register is realized.
9. independent keyboard state recognition according to claim 8 and coding method, it is characterised in that: first buffering
Register and the second buffer register are N binary registers；The N position data input pin of first buffer register connects
To N bit keyboard status signal output, the position the N data input pin of the second buffer register is connected to the N of the first buffer register
Position data output end；The reception pulse input of the reception pulse input end and the second buffer register of first buffer register
End is connected to clock pulses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810338473.0A CN108491091B (en) | 2016-01-05 | 2016-01-05 | A kind of independent keyboard state recognition and coding method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810338473.0A CN108491091B (en) | 2016-01-05 | 2016-01-05 | A kind of independent keyboard state recognition and coding method |
| CN201610003648.3A CN105677052B (en) | 2016-01-05 | 2016-01-05 | Independent keyboard state recognition and coding circuit |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610003648.3A Division CN105677052B (en) | 2016-01-05 | 2016-01-05 | Independent keyboard state recognition and coding circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108491091A CN108491091A (en) | 2018-09-04 |
| CN108491091B true CN108491091B (en) | 2019-10-18 |
Family
ID=56190367
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810338473.0A Expired - Fee Related CN108491091B (en) | 2016-01-05 | 2016-01-05 | A kind of independent keyboard state recognition and coding method |
| CN201610003648.3A Active CN105677052B (en) | 2016-01-05 | 2016-01-05 | Independent keyboard state recognition and coding circuit |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610003648.3A Active CN105677052B (en) | 2016-01-05 | 2016-01-05 | Independent keyboard state recognition and coding circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN108491091B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116820256B (en) * | 2023-08-28 | 2023-12-08 | 深圳市蓝晨科技股份有限公司 | Multi-cascade key detection method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102348A (en) * | 2007-06-28 | 2008-01-09 | 中兴通讯股份有限公司 | A keyboard circuit and method for recognizing hand-held mobile device |
| JP2010238207A (en) * | 2009-03-31 | 2010-10-21 | Brother Ind Ltd | Input device and program for the same |
| CN103279197B (en) * | 2013-06-08 | 2015-12-09 | 湖南工业大学 | A kind of Scan orientation method of keyboard |
| CN103226391B (en) * | 2013-05-22 | 2015-12-23 | 湖南工业大学 | A kind of Scan orientation method of independent keyboard |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2575305B1 (en) * | 1984-12-20 | 1987-02-13 | Peugeot | KEY CONTROL DEVICE |
| CN101510127B (en) * | 2009-03-30 | 2012-10-17 | 无锡中星微电子有限公司 | Method, apparatus and chip for implementing keyboard module composite key function |
| CN101943948B (en) * | 2009-07-07 | 2012-11-14 | 扬智科技股份有限公司 | Keyboard scanning device and keyboard scanning method |
| CN101840268B (en) * | 2010-04-23 | 2012-02-15 | 中国电子科技集团公司第五十四研究所 | Method for fast scanning and positioning of matrix keyboard |
| CN103631244A (en) * | 2013-12-22 | 2014-03-12 | 贺义方 | Master and slave type keyboard controller based on MCU (microprogrammed control unit) and CPLD (complex programmable logic device) |
-
2016
- 2016-01-05 CN CN201810338473.0A patent/CN108491091B/en not_active Expired - Fee Related
- 2016-01-05 CN CN201610003648.3A patent/CN105677052B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102348A (en) * | 2007-06-28 | 2008-01-09 | 中兴通讯股份有限公司 | A keyboard circuit and method for recognizing hand-held mobile device |
| JP2010238207A (en) * | 2009-03-31 | 2010-10-21 | Brother Ind Ltd | Input device and program for the same |
| CN103226391B (en) * | 2013-05-22 | 2015-12-23 | 湖南工业大学 | A kind of Scan orientation method of independent keyboard |
| CN103279197B (en) * | 2013-06-08 | 2015-12-09 | 湖南工业大学 | A kind of Scan orientation method of keyboard |
Non-Patent Citations (2)
| Title |
|---|
| 4×4行列式键盘控制电路设计;何凤 等;《电子世界》;20130630;第128页 * |
| 基于Verilog按键消抖设计;浩瀚之水_csdn;《CSDN》;https://blog.csdn.net/a8039974/article/details/26928251;20140525;第1-5页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105677052B (en) | 2018-05-25 |
| CN105677052A (en) | 2016-06-15 |
| CN108491091A (en) | 2018-09-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108491091B (en) | A kind of independent keyboard state recognition and coding method | |
| CN105468164B (en) | Matrix keyboard scanner uni coding circuit | |
| CN105677054B (en) | Independent keyboard Scan orientation circuit | |
| CN108519827B (en) | A kind of matrix keyboard scan method | |
| CN105680873B (en) | Independent keyboard scanning encoding circuit | |
| CN205334379U (en) | Stand alone type keyboard state recognition and coding circuit | |
| CN105677053B (en) | Independent keyboard operation identification and coding circuit | |
| CN205490497U (en) | Stand alone type keyboard scan positioning circuit | |
| CN105677051B (en) | Independent keyboard scanning circuit and coding circuit | |
| CN105471439B (en) | Independent keyboard scanner uni coding circuit | |
| CN108919974A (en) | A kind of matrix keyboard state recognition and coding method | |
| CN105677050B (en) | Independent keyboard scanning circuit and scanning encoding method | |
| CN205353947U (en) | Stand alone type keyboard scan and coding circuit | |
| CN205318332U (en) | Discernment of stand alone type key board operation and coding circuit | |
| CN105703780B (en) | Matrix keyboard Scan orientation circuit | |
| CN105700697B (en) | independent keyboard scanning circuit and method | |
| CN205485933U (en) | Matrix type keyboard scans positioning circuit | |
| CN205384581U (en) | Stand alone type keyboard scanning circuit and coding circuit | |
| CN205320063U (en) | Matrix type keyboard state recognition and coding circuit | |
| CN105680874B (en) | Matrix keyboard scanning circuit and scanning encoding method | |
| CN205318331U (en) | Matrix type keyboard scanning and coding circuit | |
| CN105700696B (en) | Matrix keyboard scanning encoding circuit | |
| CN108874164A (en) | A kind of matrix keyboard reversal process scan method | |
| CN108809321A (en) | A kind of matrix keyboard operation identification and coding method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200717 Address after: 232200 Democratic constituency of Shiji street, Anfeng Town, Shouxian County, Huainan City, Anhui Province Patentee after: Wang Jingjing Address before: 412007 science and Technology Department, Hunan University of Technology, 88 West Taishan Road, Zhuzhou, Hunan Patentee before: HUNAN University OF TECHNOLOGY Effective date of registration: 20200717 Address after: 221300 Tiefu Street, Tiefu Town, Pizhou City, Jiangsu Province (Cultural Center) Patentee after: PIZHOU TIEFU JIULONG PUBLIC SERVICE Co.,Ltd. Address before: 232200 Democratic constituency of Shiji street, Anfeng Town, Shouxian County, Huainan City, Anhui Province Patentee before: Wang Jingjing |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191018 |